MS3Pro PNP 95 Miata A/C Control-Good relays, a/c clutch engaged, no fan....
#1
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1995 Miata with MS3Pro PNP the a/c clutch engages, but the A/C Fan does not engage. Idle up works fine and main fan kicks on below Fan Control Temps. Just need the A/C to come on so I can cruise.
I started by removing the A/C relay and it bench tested fine. Energized properly with good continuity through the relay.
While the engine was running and the A/C compressor running I tested the wiring inputs to the relay. Both power wires to the hot side relay(BLU/Y) and solenoid wire (BLK/WHT) were showing 12+V. When I attached the BLU/WT wire to the relay, it did not energize the relay solenoid.
I checked the BLU/WT for ground and it was open. I've reviewed both the Miata stock wiring diagram and Megasquirt documentation and can find no control or I/O for this part of the circuit.
Does MS3Pro PNP control this circuit?
Appreciate any insight before I start inventing work arounds.
Yours truly,
Just4Fun....Smitty
I started by removing the A/C relay and it bench tested fine. Energized properly with good continuity through the relay.
While the engine was running and the A/C compressor running I tested the wiring inputs to the relay. Both power wires to the hot side relay(BLU/Y) and solenoid wire (BLK/WHT) were showing 12+V. When I attached the BLU/WT wire to the relay, it did not energize the relay solenoid.
I checked the BLU/WT for ground and it was open. I've reviewed both the Miata stock wiring diagram and Megasquirt documentation and can find no control or I/O for this part of the circuit.
Does MS3Pro PNP control this circuit?
Appreciate any insight before I start inventing work arounds.
Yours truly,
Just4Fun....Smitty
#4
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cpierr...well the hint paid off. Inj I was not assigned in the I/O pins. Ran a test mode on that I/O and the ac fan relay buzzed. Went into advanced setting/programmable I/O and set Inj I to reference coolant sensor such that it turns on at 80 degrees +- 3 degrees and fan kicked on. Reset the reference to >199 degrees.
Hit the highway with A/C, hwy temps at 95, engine held temps between 203 and 204 for 30 min at 70 mph.
Thanks again for the hint!
Just4Fun
Hit the highway with A/C, hwy temps at 95, engine held temps between 203 and 204 for 30 min at 70 mph.
Thanks again for the hint!
Just4Fun
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